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| Titel |
Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling |
| VerfasserIn |
A. Ridgwell |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 3, no. 3 ; Nr. 3, no. 3 (2007-07-10), S.387-396 |
| Datensatznummer |
250001068
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| Publikation (Nr.) |
 copernicus.org/cp-3-387-2007.pdf |
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| Zusammenfassung |
| Sediments from the Southern Ocean reveal a meridional divide in
biogeochemical cycling response to the glacial-interglacial cycles of the
late Neogene. South of the present-day position of the Antarctic Polar Front
in the Atlantic sector of the Southern Ocean, biogenic opal is generally
much more abundant in sediments during interglacials compared to glacials.
To the north, an anti-phased relationship is observed, with maximum opal
abundance instead occurring during glacials. This antagonistic response of
sedimentary properties provides an important model validation target for
testing hypotheses of glacial-interglacial change against, particularly for
understanding the causes of the concurrent variability in atmospheric
CO2. Here, I illustrate a time-dependent modelling approach to helping
understand climates of the past by means of the mechanistic simulation of
marine sediment core records. I find that a close match between
model-predicted and observed down-core changes in sedimentary opal content
can be achieved when changes in seasonal sea-ice extent are imposed, whereas
the predicted sedimentary response to iron fertilization on its own is not
consistent with sedimentary observations. The results of this sediment
record model-data comparison supports previous inferences that the changing
cryosphere is the primary driver of the striking features exhibited by the
paleoceanographic record of this region. |
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